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ExecutingQueryStatus.java
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ExecutingQueryStatus.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.neo4j.storageengine.api.lock.ResourceType;
import org.neo4j.time.SystemNanoClock;
import static java.util.Collections.singletonMap;
import static java.util.Collections.unmodifiableMap;
/**
* Internal representation of the status of an executing query.
*
* This is used for inspecting the state of a query.
*
* @see ExecutingQuery#status
*/
abstract class ExecutingQueryStatus
{
abstract long waitTimeNanos( SystemNanoClock clock );
abstract Map<String,Object> toMap( SystemNanoClock clock );
private static final Map<String,Object> RUNNING_STATE = unmodifiableMap( singletonMap( "state", "RUNNING" ) );
static final ExecutingQueryStatus RUNNING = new ExecutingQueryStatus()
{
@Override
long waitTimeNanos( SystemNanoClock clock )
{
return 0;
}
@Override
Map<String,Object> toMap( SystemNanoClock clock )
{
return RUNNING_STATE;
}
};
static class WaitingOnLock extends ExecutingQueryStatus
{
private final ResourceType resourceType;
private final long[] resourceIds;
private final long startTimeNanos;
WaitingOnLock( ResourceType resourceType, long[] resourceIds, long startTimeNanos )
{
this.resourceType = resourceType;
this.resourceIds = resourceIds;
this.startTimeNanos = startTimeNanos;
}
@Override
long waitTimeNanos( SystemNanoClock clock )
{
return clock.nanos() - startTimeNanos;
}
@Override
Map<String,Object> toMap( SystemNanoClock clock )
{
Map<String,Object> map = new HashMap<>();
map.put( "state", "WAITING" );
map.put( "waitTimeMillis", TimeUnit.NANOSECONDS.toMillis( waitTimeNanos( clock ) ) );
map.put( "resourceType", resourceType.toString() );
map.put( "resourceIds", resourceIds );
return map;
}
}
}